resdb_driver/transaction.py [831:846]:
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    @classmethod
    def _sign_simple_signature_fulfillment(cls, input_, message, key_pairs):
        """! Signs a Ed25519Fulfillment.

        @param input_ (:class:`~resdb.transaction.Input`) The Input to be signed.
        @param message (str): The message to be signed
        @param key_pairs (dict): The keys to sign the Transaction with.
        """
        # NOTE: To eliminate the dangers of accidentally signing a condition by
        #       reference, we remove the reference of input_ here
        #       intentionally. If the user of this class knows how to use it,
        #       this should never happen, but then again, never say never.
        input_ = deepcopy(input_)
        public_key = input_.owners_before[0]
        message = sha3_256(message.encode())
        if input_.fulfills:
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service/sdk_validator/resdb_validator/transaction.py [889:906]:
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    @classmethod
    def _sign_simple_signature_fulfillment(cls, input_, message, key_pairs):
        """Signs a Ed25519Fulfillment.

            Args:
                input_ (:class:`~resdb_validator.transaction.
                    Input`) The input to be signed.
                message (str): The message to be signed
                key_pairs (dict): The keys to sign the Transaction with.
        """
        # NOTE: To eliminate the dangers of accidentally signing a condition by
        #       reference, we remove the reference of input_ here
        #       intentionally. If the user of this class knows how to use it,
        #       this should never happen, but then again, never say never.
        input_ = deepcopy(input_)
        public_key = input_.owners_before[0]
        message = sha3_256(message.encode())
        if input_.fulfills:
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